There is still no universally agreed-on explanation for why there should be such a dramatic cessation of tree growth at the upper timberline.
对于为什么树线以上的树木会突然停止生长，至今还没有一个公认的解释。
Without the right growing conditions, trees cannot get really big, and there is some evidence to suggest tree growth could slow in a warmer world, particularly in environments that are already warm.
没有合适的生长条件，树木就不能长得很高大。还有一些证据表明，在世界气候温暖的时候，尤其是在原本已经很温暖的环境里，树木的生长可能会放缓。
Insects and pathogens are integral components of forest ecosystems and normally are present at a relatively low density, causing little damage, and having negligible impact on tree growth and vigour.
昆虫和病原体是森林生态系统的固有成分，通常其密度相对较低，所造成的损害较小，对树木生长及其活力的影响微乎其微。
In the soil of marriage, let two character of tree growth, free nature can harvest the fruits of happiness.
在婚姻的土壤中，让两棵个性之树自由成长，自然可以收获幸福的果实。
Competition is a vital factor to affect tree growth.
竞争是影响树木生长的重要因素。
Tree mortality model is an important part of tree growth model system.
林木枯损模型是林木生长模型系统的重要组成部分。
Tree mortality model is an important part of tree growth and yield model system.
林木枯损率模型是树木生长与收获模拟系统中的一个重要组成部分。
Critical value of salinity tolerance should be determined during tree growth period.
树种耐盐临界值，应以林木生长期测定为准。
Also, the tree growth and the soil enzyme activity of mixed stand were all better than that of the pure stands.
在树木生长表现和土壤酶活性发挥方面，混交林优于纯林。
First, cleaning up a forest after a fire or storm does not necessarily create the right conditions for tree growth.
首先，在大火或者暴风雨之后的清理并不一定会给树的生长提供合适的生长环境。
This paper forms competition index by means of principle elements analysis and sets up individual tree growth model.
本文用主成分分析的方法构造竞争指标并建立单木生长模型。
Monoecy was significantly associated with the tree growth form and was relatively common in seasonal forest vegetation.
雌雄同株异花与乔木生活型显著相关并在季节性雨林植被中相对普遍。
The research results provide methods for the control of fruit tree profile spray and collecting information on fruit tree growth.
研究结果为果树仿行喷雾控制和果园果树生长信息采集提供了技术方法。
There is still no universally agreed-on explanation fir why there should be such a dramatic cessation of tree growth at the upper timberline.
目前还没有一个普遍认同的解释来说明为什么会在树带界线上出现树木停止生长这种戏剧化的现象。
By canonical correlation analysis, sampling time was selected, and foliar mutriment elements closely related to forest tree growth were determined.
用典型相关分析方法选择采样时间、确定与林木生长有密切关系的叶片养分元素。
Based on the site classification and site evaluation, the matrix models (size class model) and individual tree growth model was developed in this paper.
本文在对落叶松人工林进行立地分类和立地质量评价的基础上，建立了落叶松人工林的矩阵模型和单木生长模型。
Study the effects of branch drawing on the tree growth, light environment, fruit quality and yield of jujube in direct seeding close planting jujube field.
拉枝对直播密植枣园树体生长、光环境以及枣果产量和品质的影响。
The results showed that potassium application could raise the SPAD-502 chlorophyll test value, promote citrus tree growth, increase fruit yield and improve quality.
结果表明，施钾能有效地提高叶绿素值、促进树体生长、提高果实产量和改善品质。
With the way of runoff plots, effects of the different ways of sod in the eroded slope orchard on soil erosion, soil fertility, fruit tree growth, the output and quality of fruit were studied.
采用径流小区法研究果园不同生草方式对土壤侵蚀、土壤肥力、果树生长、果实产量和品质的影响。
The results showed that the integrated cultural practices not only raised the tree growth and the nut yield, but also increased the content of organic matter and improved the fertility of soil.
结果表明：组装配套栽培措施不仅可以促进树体生长和大幅度提高产量，同时也能提高土壤有机质含量和改善土壤肥力状况。
The young trees of open-center shaped Housui pear were used as the material to study the effect of different pruning rate(light, heavy and no) on the pear tree growth, fruiting and root growth.
以开心形丰水梨幼树为试材，通过轻剪、重剪和不修剪处理对其树体生长指标、产量、根系分布度进行比较分析。
By assuming that tree growth under optimum conditions is proportional to its leaf biomass and is inversely proportional to its size, the optimum growth model has been derived for the 8 species.
设在最佳环境条件下树木的生长与叶量成正比，与本身大小成反比，推导出树木最优生长模型。
The morphological index when correlated linearly with tree growth in single tree evaluation of plus trees selection is thought to be a basis for increasing accuracy and quality of selected trees.
把对林木生长量有直接关系的形质指标，作为单株评价的一部分，考虑在单株选择之中，作为提高单株选优质量和准确性的根据。
Result shows, This competition index is suitable to Chinese fir man-made forest, and individual tree growth model accords with the demands of accuracy, it can be used to estimate growth of stands.
结果表明：该竞争指标对杉木人工林适用，所建立的单木生长模型符合精度要求，可用于预估林分生长。
But after the garden is planted trees, it is necessary for good conservation management to ensure survival and healthy tree growth and development to achieve the effect of green planning and design.
但是园林树木栽植后，需要良好的养护管理才能保证树木成活和健康地成长发育，达到绿化规划设计的效果。
Compared to the usual situation of tree-growth at lower elevation limits being constrained by precipitation results indicated an enhanced role of temperature and a reduced role of precipitation.
与通常情况“下限树木生长受降水制约”比较，这里的温度作用增强而降水限制减弱。
Compared to the usual situation of tree-growth at lower elevation limits being constrained by precipitation results indicated an enhanced role of temperature and a reduced role of precipitation.
与通常情况“下限树木生长受降水制约”比较，这里的温度作用增强而降水限制减弱。
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